iOS 后臺作業持久存儲：Queue for iOS

Queue 是一個將iOS的后臺作業隊列持久存儲的開發包。示例代碼：

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    [[EDQueue sharedInstance] setDelegate:self];
    [[EDQueue sharedInstance] start];
}

- (void)applicationWillResignActive:(UIApplication *)application
{
    [[EDQueue sharedInstance] stop];
}

- (EDQueueResult)queue:(EDQueue *)queue processJob:(NSDictionary *)job
{
    sleep(1);           // This won't block the main thread. Yay!

    // Wrap your job processing in a try-catch. Always use protection!
    @try {
        if ([[job objectForKey:@"task"] isEqualToString:@"success"]) {
            return EDQueueResultSuccess;
        } else if ([[job objectForKey:@"task"] isEqualToString:@"fail"]) {
            return EDQueueResultFail;
        }
    }
    @catch (NSException *exception) {
        return EDQueueResultCritical;
    }

    return EDQueueResultCritical;
}

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